Thomas hamilton



UNITED STATES PATENT OFFICE.

THOMAS HAMILTON, OF NEW BRUNSWICK, NEW JERSEY.

LOW-WATER ALARM FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 246,007, dated August 23, 1881.

Application filed June 8, 1981. (No model.)

To all whom it may concern Be it known that I, THoMAs HAMILTON, a citizen of the United States, residing at New Brunswick, in the State of New Jersey, have invented a new and useful Improvement in Low-WaterAlarms for Steam-Boilers, of Which the following is a specification.

This invention relates to that class of wateralarms in which the movement of an external alarm-starter in the form of a hollow ball, or a like vessel of any shape adapted to contain steam and water, is controlled by the level of the water in the boiler through the agency simply of pipe-connections with the water and steam-space above and below the mean waterline.

The present invention consists, first, in the combination, in a water-alarm of this description, of apairof stationary hearings supported by the respective pipe-connections with the boiler, a horizontal double-ended spigot or recessed hub, working water and steam tight in said bearings, and a pair of tubes forming, with said hub, a lever, and connected therethrough with the water and steam spaces, respectively, as means for connecting a hollow ball or the like both with the water-space and with the steam-space in a simple and efficient way, so

that it may instantaneously empty itself and rise and start the alarm when the water falls below agiven level without the aid of flexible tubes.

This invention consists, secondly, in the aforesaid combination of parts in connection with a steam-whistle attached to the said hearing, which communicates with the steam-space, the steam end of the said spigot being constructed so as to turn the steam into the whistle when the emptied ball rises.

a perspective view of the upper part of the front of a steam-boiler provided with my lowwater alarm, showing the latter as in the act of sounding an alarm. Fig. 2 is a half-elevation of the same, showing the parts at rest with the ball down. Fig. 3 represents a horizontal section on the line 3 3, Fig. 2; Fig. 4, a vertical section at 4 4, Fig. 1; and Fig. 5 a vertical section on the line 5 5, Fig. 2.

Like letters of refereneeindicate corresponding parts in the several figures.

A represents an illustrative steam-boiler set in brick-work, and B an alarm-starter in the form of a hollow copper hall, for which 1 may substitute a like vessel of any shape and material, containing a chamber of a capacity of four quarts, more or less, and adapted to sustain alternately steam and atmospheric pressure.

S and Wrepresent steam and water pipe connections of five-eighths inch iron or brass tubing, screwed into the front of the boiler A, above and below the mean waterline respectively, and provided with stop-cocks.

B and B represent sleeve-bearings, supported respectively by the steam and water connections; H, a double-ended spigot or recessed hub working water and steam tight in said bearings; and T=T', a pair of rigid pipes or tubes screwed into said hub, so as to communicate with the recesses in its respective ends, and connected therethrough respectively with the steam and water spaces of the boiler,

said tubes T T forming, with said hub H, a lever orswinging arm, to the outer end of which the ballB is coupled, as illustrated more particularly by Fig. 5. As shown in this figure, the bottom of the ball is provided with a cast saddle or coupling-piece, c, which may be soldered thereto, and which has a pair of necks to receive respectively the extremity of the steam'tube T and a suitable union at the extremity ot' the water-tube T, providing for the attachment of apet-cock, p. of the steam-tube is screwed into the top of the coupling-piece c and reaches to the top of the chamber within the ball. When the ball B is down, as illustrated by Figs. 2 and 3, and by the line 2, Fig. 4, the steam-space of the An extension, t

(No Model.)

A. HAMPE.

PISTON PAGKING.

Patented Aug. 23,1881.

IN VBNTOR ATTORNEY 

